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Data Platform/Data Lake/Edits/MediaWiki history dumps/Scala spark examples

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This page provides examples of using Scala Spark to process the Mediawiki history dumps.

Loading the data (unescape strings and split arrays)

// Update this value to you path
val mediawiki_history_path = "/PATH/TO/MEDIAWIKI/HISTORY/FILES"

import org.apache.spark.sql.types._

// Note: string unescaping and array conversion is done later
val mediawiki_history_schema = StructType(Seq(

  StructField("wiki_db", StringType, nullable = false),
  StructField("event_entity", StringType, nullable = false),
  StructField("event_type", StringType, nullable = false),
  StructField("event_timestamp", StringType, nullable = true),
  StructField("event_comment_escaped", StringType, nullable = true),

  StructField("event_user_id", LongType, nullable = true),
  StructField("event_user_text_historical_escaped", StringType, nullable = true),
  StructField("event_user_text_escaped", StringType, nullable = true),
  StructField("event_user_blocks_historical_string", StringType, nullable = true),
  StructField("event_user_blocks_string", StringType, nullable = true),
  StructField("event_user_groups_historical_string", StringType, nullable = true),
  StructField("event_user_groups_string", StringType, nullable = true),
  StructField("event_user_is_bot_by_historical_string", StringType, nullable = true),
  StructField("event_user_is_bot_by_string", StringType, nullable = true),
  StructField("event_user_is_created_by_self", BooleanType, nullable = true),
  StructField("event_user_is_created_by_system", BooleanType, nullable = true),
  StructField("event_user_is_created_by_peer", BooleanType, nullable = true),
  StructField("event_user_is_anonymous", BooleanType, nullable = true),
  StructField("event_user_registration_timestamp", StringType, nullable = true),
  StructField("event_user_creation_timestamp", StringType, nullable = true),
  StructField("event_user_first_edit_timestamp", StringType, nullable = true),
  StructField("event_user_revision_count", LongType, nullable = true),
  StructField("event_user_seconds_since_previous_revision", LongType, nullable = true),

  StructField("page_id", LongType, nullable = true),
  StructField("page_title_historical_escaped", StringType, nullable = true),
  StructField("page_title_escaped", StringType, nullable = true),
  StructField("page_namespace_historical", IntegerType, nullable = true),
  StructField("page_namespace_is_content_historical", BooleanType, nullable = true),
  StructField("page_namespace", IntegerType, nullable = true),
  StructField("page_namespace_is_content", BooleanType, nullable = true),
  StructField("page_is_redirect", BooleanType, nullable = true),
  StructField("page_is_deleted", BooleanType, nullable = true),
  StructField("page_creation_timestamp", StringType, nullable = true),
  StructField("page_first_edit_timestamp", StringType, nullable = true),
  StructField("page_revision_count", LongType, nullable = true),
  StructField("page_seconds_since_previous_revision", LongType, nullable = true),

  StructField("user_id", LongType, nullable = true),
  StructField("user_text_historical_escaped",  StringType, nullable = true),
  StructField("user_text_escaped", StringType, nullable = true),
  StructField("user_blocks_historical_string", StringType, nullable = true),
  StructField("user_blocks_string", StringType, nullable = true),
  StructField("user_groups_historical_string", StringType, nullable = true),
  StructField("user_groups_string", StringType, nullable = true),
  StructField("user_is_bot_by_historical_string", StringType, nullable = true),
  StructField("user_is_bot_by_string", StringType, nullable = true),
  StructField("user_is_created_by_self", BooleanType, nullable = true),
  StructField("user_is_created_by_system", BooleanType, nullable = true),
  StructField("user_is_created_by_peer", BooleanType, nullable = true),
  StructField("user_is_anonymous", BooleanType, nullable = true),
  StructField("user_registration_timestamp", StringType, nullable = true),
  StructField("user_creation_timestamp", StringType, nullable = true),
  StructField("user_first_edit_timestamp", StringType, nullable = true),

  StructField("revision_id", LongType, nullable = true),
  StructField("revision_parent_id", LongType, nullable = true),
  StructField("revision_minor_edit", BooleanType, nullable = true),
  StructField("revision_deleted_parts_string", StringType, nullable = true),
  StructField("revision_deleted_parts_are_suppressed", BooleanType, nullable = true),
  StructField("revision_text_bytes", LongType, nullable = true),
  StructField("revision_text_bytes_diff", LongType, nullable = true),
  StructField("revision_text_sha1", StringType, nullable = true),
  StructField("revision_content_model", StringType, nullable = true),
  StructField("revision_content_format", StringType, nullable = true),
  StructField("revision_is_deleted_by_page_deletion", BooleanType, nullable = true),
  StructField("revision_deleted_by_page_deletion_timestamp", StringType, nullable = true),
  StructField("revision_is_identity_reverted", BooleanType, nullable = true),
  StructField("revision_first_identity_reverting_revision_id", LongType, nullable = true),
  StructField("revision_seconds_to_identity_revert", LongType, nullable = true),
  StructField("revision_is_identity_revert", BooleanType, nullable = true),
  StructField("revision_is_from_before_page_creation", BooleanType, nullable = true),
  StructField("revision_tags_string", StringType, nullable = true)
))

// Note: It's important to set .option("quote", "") to prevent spark to automaticallu use double-quotes to quote text
val mediawiki_history_raw = spark.read.option("delimiter", "\t").option("quote", "").schema(mediawiki_history_schema).csv(mediawiki_history_path)

// Unescaping and array-splitting UDFs

val unescape = (str: String) => if (str == null) null else str.replace("\\n", "\n").replace("\\r", "\r").replace("\\t", "\t")
// The comma splitter applies a negative lookahead for \ to prevent splitting escaped commas
val commaSplitter = "(?<!\\\\),".r
val toArray = (str: String) => if (str == null) Array.empty[String] else commaSplitter.split(unescape(str)).map(_.trim.replace("\\,", ","))

spark.udf.register("unescape", unescape)
spark.udf.register("to_array", toArray)

// Update dataframe using unescaping and array-splitting UDFs
val mediawiki_history = mediawiki_history_raw.selectExpr(
  
  "wiki_db",
  "event_entity",
  "event_type",
  "event_timestamp",
  "unescape(event_comment_escaped) AS event_comment",
  
  "event_user_id",
  "unescape(event_user_text_historical_escaped) AS event_user_text_historical",
  "unescape(event_user_text_escaped) AS event_user_text",
  "to_array(event_user_blocks_historical_string) AS event_user_blocks_historical",
  "to_array(event_user_blocks_string) AS event_user_blocks",
  "to_array(event_user_groups_historical_string) AS event_user_groups_historical",
  "to_array(event_user_groups_string) AS event_user_groups",
  "to_array(event_user_is_bot_by_historical_string) AS event_user_is_bot_by_historical",
  "to_array(event_user_is_bot_by_string) AS event_user_is_bot_by",
  "event_user_is_created_by_self",
  "event_user_is_created_by_system",
  "event_user_is_created_by_peer",
  "event_user_is_anonymous",
  "event_user_registration_timestamp",
  "event_user_creation_timestamp",
  "event_user_first_edit_timestamp",
  "event_user_revision_count",
  "event_user_seconds_since_previous_revision",
  
  "page_id",
  "unescape(page_title_historical_escaped) AS page_title_historical",
  "unescape(page_title_escaped) AS page_title",
  "page_namespace_historical",
  "page_namespace_is_content_historical",
  "page_namespace",
  "page_namespace_is_content",
  "page_is_redirect",
  "page_is_deleted",
  "page_creation_timestamp",
  "page_first_edit_timestamp",
  "page_revision_count",
  "page_seconds_since_previous_revision",
  
  "user_id",
  "unescape(user_text_historical_escaped) AS user_text_historical",
  "unescape(user_text_escaped) AS user_text",
  "to_array(user_blocks_historical_string) AS user_blocks_historical",
  "to_array(user_blocks_string) AS user_blocks",
  "to_array(user_groups_historical_string) AS user_groups_historical",
  "to_array(user_groups_string) AS user_groups",
  "to_array(user_is_bot_by_historical_string) AS user_is_bot_by_historical",
  "to_array(user_is_bot_by_string) AS user_is_bot_by",
  "user_is_created_by_self",
  "user_is_created_by_system",
  "user_is_created_by_peer",
  "user_is_anonymous",
  "user_registration_timestamp",
  "user_creation_timestamp",
  "user_first_edit_timestamp",
  
  "revision_id",
  "revision_parent_id",
  "revision_minor_edit",
  "to_array(revision_deleted_parts_string) AS revision_deleted_parts",
  "revision_deleted_parts_are_suppressed",
  "revision_text_bytes",
  "revision_text_bytes_diff",
  "revision_text_sha1",
  "revision_content_model",
  "revision_content_format",
  "revision_is_deleted_by_page_deletion",
  "revision_deleted_by_page_deletion_timestamp",
  "revision_is_identity_reverted",
  "revision_first_identity_reverting_revision_id",
  "revision_seconds_to_identity_revert",
  "revision_is_identity_revert",
  "revision_is_from_before_page_creation",
  "to_array(revision_tags_string) AS revision_tags"
)

// Have fun with data :)
// Top 10 projects in number of revisions for month 2019-12
mediawiki_history.
  where("event_entity = 'revision' and event_type = 'create'").
  selectExpr("wiki_db", "SUBSTR(event_timestamp, 0, 7) as month").
  where("month = '2019-12'").
  groupBy("wiki_db", "month").
  agg(count(lit(1L)).as("revision_count")).
  sort(desc("revision_count")).
  show(10, false)

/*
+--------------+-------+--------------+                                         
|wiki_db       |month  |revision_count|
+--------------+-------+--------------+
|wikidatawiki  |2019-12|21511762      |
|commonswiki   |2019-12|6046688       |
|enwiki        |2019-12|4756250       |
|arwiki        |2019-12|1599840       |
|frwiki        |2019-12|903838        |
|dewiki        |2019-12|795638        |
|eswiki        |2019-12|710516        |
|viwiki        |2019-12|679525        |
|ruwiki        |2019-12|652051        |
|itwiki        |2019-12|563592        |
+--------------+-------+--------------+
only showing top 10 rows
*/
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